Rotational Viscometer

Rotational viscometers have become a standard in virtually all industries. They measure viscosity by sensing the torque required to rotate a spindle at constant speed while immersed in fluid. The torque is proportional to the viscous drag on the spindle; thus the sample viscosity.

Rotational viscometer offers several advantages:

• The continuous rotation of the spindle allows measurements to be made over time, permitting analysis of time-dependent fluids
• The rate of shear is constant, so both Newtonian and non-Newtonian fluids can be tested
• By rotating the spindle at several different speeds, shear dependent behavior can be analyzed